33   uintptr_t _start;
  34   uintptr_t _end;
  35 
  36 public:
  37   ZVirtualMemory();
  38   ZVirtualMemory(uintptr_t start, size_t size);
  39 
  40   bool is_null() const;
  41   uintptr_t start() const;
  42   uintptr_t end() const;
  43   size_t size() const;
  44 
  45   ZVirtualMemory split(size_t size);
  46 };
  47 
  48 class ZVirtualMemoryManager {
  49 private:
  50   ZMemoryManager _manager;
  51   bool           _initialized;
  52 
  53   bool reserve(uintptr_t start, size_t size);
  54   void nmt_reserve(uintptr_t start, size_t size);
  55 
  56 public:
  57   ZVirtualMemoryManager();
  58 
  59   bool is_initialized() const;
  60 
  61   ZVirtualMemory alloc(size_t size, bool alloc_from_front = false);
  62   void free(const ZVirtualMemory& vmem);
  63 };
  64 
  65 #endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP

  33   uintptr_t _start;
  34   uintptr_t _end;
  35 
  36 public:
  37   ZVirtualMemory();
  38   ZVirtualMemory(uintptr_t start, size_t size);
  39 
  40   bool is_null() const;
  41   uintptr_t start() const;
  42   uintptr_t end() const;
  43   size_t size() const;
  44 
  45   ZVirtualMemory split(size_t size);
  46 };
  47 
  48 class ZVirtualMemoryManager {
  49 private:
  50   ZMemoryManager _manager;
  51   bool           _initialized;
  52 
  53   bool reserve_range(uintptr_t start, size_t size);
  54   size_t reserve(uintptr_t start, size_t size);
  55 
  56 public:
  57   ZVirtualMemoryManager();
  58 
  59   bool is_initialized() const;
  60 
  61   ZVirtualMemory alloc(size_t size, bool alloc_from_front = false);
  62   void free(const ZVirtualMemory& vmem);
  63 };
  64 
  65 #endif // SHARE_GC_Z_ZVIRTUALMEMORY_HPP